Astray is from someone to be away from the correct path or direction. This refers to the Doctor, Charles and Katarina trying to get back to the TARDIS, accidently using a portal device, they are sent to another world, going in the incorrect direction.

An updated version of the Opening Sequence is introduced. Charles Siringo is added to it, a new font, a new text effect, and new clips from "Catacomb" and "Astray" are added.

This episode features The Fourth Doctor and Davros, although archive voices are only heard.

Charles Siringo inclusion to the opening sequence makes the first time the cast has gone from two people to three. This would remain like this until "Nemesis" when it goes to four.

Titles that were under consideration were "Authentic", "Stray" and "Artefact".

This is the first episode to feature no recap, with the exception of "Missive"

This is the first episode not to feature the TARDIS at all. It would not be seen in the next episode "Annihilation" either. The exterior of the TARDIS wouldn't been seen until "Pursuit", and the interior wouldn't be seen until "Outbreak".

The pre-credits saying the creator, title and part are no longer present. Instead the credits just begin with "Guest Starring". These credits wouldn't become present again until The Angels Who Cried Wolf.

This is the first episode to be in HD. This was originally supposed to happen in "Catacomb", but due to difficulties this did not happen until this episode.

If one looks closely in the scene where the Doctor looks out the building, from the exterior shot of the building you can see the Doctor in one of the windows.

The voice of the Dalek was achieved by using Sound Clips from the New Series episode "Asylum of the Daleks".

When the Dalek attempts to identify the Doctor, scenes from the Old Series and New Series are shown. Episodes such as Talons of Weng-Chiang, The Caves of Androzani, Remembrance of the Daleks, "New Blood", Vengence on Varos, Day of the Daleks, Enlightenment, Genesis of the Daleks, An Unearthly Child, The Curse of Peladon, The Sea Devils, The Deadly Assassin, The Chase, "The Lodger", and "Night Terrors" are shown. An audio line from Robots of Death is also featured, as so is Genesis of the Daleks.

When the Doctor first uses the Portal device to travel to the desert, there was a shot of the Doctor arriving through the device. This was deleted because of unsatisfactory visuals. This scene can be briefly seen in the Trailer for The Labyrinth of Time.

Originally there was a scene not long before you the Dalek army is seen, where parts of the army arriving through the electricity Portal are seen. This scene was deleted because the Visual Effect was deemed unsatisfactory. This scene can be briefly seen in the Trailer for The Labyrinth of Time.

After the Dalek army is seen, there was originally going to be a sequence where the army decides to attack the Doctor, and his companion from the cliff, and other Daleks hovering over them. This was filmed, and only small parts of it were edited. The reason it was not done, was because it was pain stacken editing. So editing of it was scraped and replaced with an alternate sequence where the Doctor, Katarina and Charles find a device that teleports them to the city.

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